In theory it should be able to dispose everything itself.
There are a couple of things it won't be disposing at the moment, and there is a lack in the API for doing it as well. One of them are assets. There is an internal caching mechanism for all assets loaded with Balder. These are at the moment not getting cleaned
out even there are no references to them.
There will become a reference counting solution for these that will ensure that they are garbage collected.
Also, there has been reports of a couple of memory leakage situations - something that is also under way in being dealt with.